1. Electronic Reconstruction at the IsopolarLaTiO3/LaFeO3Interface: An X-Ray Photoemission and Density-Functional Theory Study
- Author
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Ralph Claessen, Guus Rijnders, A. Müller, J. E. Kleibeuker, Hiroaki Nishikawa, Judith Gabel, Gertjan Koster, Zhicheng Zhong, F. Pfaff, Karsten Held, and Michael Sing
- Subjects
X ray photoemission ,Physics ,Condensed matter physics ,General Physics and Astronomy ,Heterojunction ,02 engineering and technology ,Electron ,021001 nanoscience & nanotechnology ,01 natural sciences ,X-ray photoelectron spectroscopy ,Crystal field theory ,0103 physical sciences ,Antiferromagnetism ,Condensed Matter::Strongly Correlated Electrons ,Density functional theory ,010306 general physics ,0210 nano-technology - Abstract
We report the formation of a nonmagnetic band insulator at the isopolar interface between the antiferromagnetic Mott-Hubbard insulator ${\mathrm{LaTiO}}_{3}$ and the antiferromagnetic charge transfer insulator ${\mathrm{LaFeO}}_{3}$. By density-functional theory calculations, we find that the formation of this interface state is driven by the combination of O band alignment and crystal field splitting energy of the ${t}_{2g}$ and ${e}_{g}$ bands. As a result of these two driving forces, the Fe $3d$ bands rearrange and electrons are transferred from Ti to Fe. This picture is supported by x-ray photoelectron spectroscopy, which confirms the rearrangement of the Fe $3d$ bands and reveals an unprecedented charge transfer up to $1.2\ifmmode\pm\else\textpm\fi{}0.2\text{ }\text{ }{e}^{\ensuremath{-}}/\text{interface}$ unit cell in our ${\mathrm{LaTiO}}_{3}/{\mathrm{LaFeO}}_{3}$ heterostructures.
- Published
- 2014